Full text of "The Flow Of Gases In Furnaces"

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```DESIGN OF OPEN-HEARTH FURNACES

273

Gas on Gas
Air on Air
Gas on Waste Gas
Air on Waste
Gas

Frictional resistance in checkers: SL = heating surface = m2 == ......
2560
4267 5

co = total area of passes m2 ......
11.664
19 440

\$ L ~i~ w ==
219 5
219 5      t

vt = velocity m per sec
1 879
1 642
2 405
1 964

AO = specific weigh *"< gases
1  125
1 293
1 320
1 320

t° =s average temperature .
850°
750°
1200°
1100°

1 -\-<xt ==gas factor for t° = .
4 1195
3 7525
5 4040
5 0370

Aj = Ao-J-(l+aO = .............
0.2731
0 3445
0 2443
0 2621

y=kg per m2 friction loss X =0.016X219.5X 1.879X0.273 =
1 kg 802

0.016X219.5X1.642X0.3445 =

1 kg 987

0.016X219.5X2.405X0.244  =

2 kg 064

0.016X219.5XL964X0.2621 =

1 kg 808

As the gases enter and leave the checkerwork they make a 90°
change in their direction of flow, which is equivalent to a total
absorption of their velocity head. The pressure necessary to
impress upon the flowing gases their velocity in the checkers will be:

Gas
Air
Gas on
Air on

on
on
Waste
Waste

Gas
Air
Gas
Ga

h =vt-r- 2g~ meters of gas   olumn.
0.180
0.137
0.295
0.197

5 == h&t — kg per m2 = ...........
0. 49
0.047
0.072
0 052

```